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Jacob is 20 y old when he takes off on a road trip space voyage at...

Jacob is 20 y old when he takes off on a road trip space voyage at a speed of .8 c to a star and come back to earth at age 27 as his time measured in moving frame. His twin sister who stayed on Earth will find her age diff from Jacob. What will be her twin sister's age when Jacob return to Earth from space voyage.

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